JPS55153643A - Compression working method - Google Patents

Abstract

PURPOSE: To make possible higher efficiency while maintaining higher yield of blanks and higher-accuracy forming by extruding the blank mainly to the lateral side to form its central recess, height and lateral extruded parts to the specific sizes then extruding this mainly in the height direction to the forming size.

CONSTITUTION: After the blank 1 is hermetically closed by dies 2, 3, it is so compressed as to be extruded mainly in the lateral direction by the descending and ascending of the punches 4, 5 of relatively short end protrusions 4a, 5a. This forms the blank down to the intermediate molding 10' of which the central recesses 10a', 10b' are shallower than recesses 10a, 10b, the height H' is lower than the height H and the lateral extruded parts 10c'W10h' are close to the same parts 10cW10h. Next, this is hermetically closed with dies 6, 7, after which it is so compressed as to be extruded mainly in the height direction down to the forming size by the descending and ascending of the punches 8, 9 of relatively long end protrusions 8a, 9a. Thereby, the axially symmetrical part 10 having the recesses 10a, 10b in the center, a thin excess metal part 10i therebetween and laterally extruded parts 10cW 10h on the outside circumference is formed. Thence, the excess metal part 10i is blanked by a punch.

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